It is difficult to peel off the PET protective film. When the profile product device is peeled off, the protective film cannot be effectively peeled off. The reasons are two possibilities. First, the sensitive adhesive used in the protective film product is not a special protective adhesive for the protective film. Of course, the protective film works very well when it is pasted, but it will be very difficult to peel off. This is also the most common problem of the protective film produced by some illegal PET protective film product manufacturers. Another possibility is the protective film. The raw material used in the master tape is too soft to withstand the pulling force during peeling, and cracking occurs during peeling, which is a problem for users.